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  3. Are you aware that you actually possess six senses? The sixth is a muscular sense responsible for direction your muscles

Are you aware that you actually possess six senses? The sixth is a muscular sense responsible for direction your muscles

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问题   Are you aware that you actually possess six senses? The
sixth is a muscular sense responsible for direction your muscles          【M1】______
intelligently -- to the exact extent necessary for each action you        
perform. For example, when you reach an object, the sensory               【M2】______
nerves link the muscles to the brain stop your hand at the collect        【M3】______
spot. This automatic perception of the position of your muscles           
in relation to the object is your muscular sense in action.               
  Muscles various from one five-thousandths of an inch to                【M4】______
about three inches. They have three unique characteristics: they         
can become shorter and thicker, they can stretch; and they can              
retract to their original positions. Under a high-power                   【M5】______
microscope, muscle tissue is seen as long, slender cells with a            
grainy texture as wood.                                                   【M6】______
  More than half of a person’s body is composed of muscle               
fibers, most of them are involuntary -- in other words, work              【M7】______
without conscious direction. The involuntary muscles, those that          【M8】______
we move consciously to perform particular actions, numbering              【M9】______
more than five hundred. Women have only 60 to 4 percent as                 
many muscle as men for their body mass.  That is why an                   【M10】______
average woman can’t lift as much, throw as far, or hit as hard as
an average man.
【M8】
选项
答案involuntary改成voluntary
解析
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大学英语四级

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